Hello all, Okay here's what adjustments were made the night before I woke up to a grey cloud lol. Okay first off I got a fresh shipment of fish in the mail which were then added to the tank. Okay now I suspect it's one of these two products I added after the fish were settled, API Stress Zyme and Top Fin water conditioner which is a petsmart brand. So far I have done a 20% water change and replaced all chemical media in my canister filter. Fresh Carbon, Fluval Clearmax and Cobalt Total Reef, Same as Purigen.